/* -------------------------------------------------------------------------
 *
 * linux.h
 *		Port-specific prototypes for Linux
 *
 *
 * Portions Copyright (c) 1996-2012, PostgreSQL Global Development Group
 * Portions Copyright (c) 1994, Regents of the University of California
 *
 * src/backend/port/dynloader/linux.h
 *
 * -------------------------------------------------------------------------
 */
#ifndef PORT_PROTOS_H
#define PORT_PROTOS_H

#include "utils/dynamic_loader.h" /* pgrminclude ignore */
#ifdef HAVE_DLOPEN
#include <dlfcn.h>
#endif

#ifdef HAVE_DLOPEN

/*
 * In some older systems, the RTLD_NOW flag isn't defined and the mode
 * argument to dlopen must always be 1.  The RTLD_GLOBAL flag is wanted
 * if available, but it doesn't exist everywhere.
 * If it doesn't exist, set it to 0 so it has no effect.
 */
#ifndef RTLD_NOW
#define RTLD_NOW 1
#endif
#ifndef RTLD_GLOBAL
#define RTLD_GLOBAL 0
#endif

/*
 * Use RTLD_NOW and RTLD_RTLD_LOCAL
 *
 * Use RTLD_LOCAL avoid the symbols will be made available for symbol
 * resolution of subsequently loaded libraries.
 */
#define pg_dlopen(f) dlopen((f), RTLD_NOW | RTLD_LOCAL)
#define pg_dlsym dlsym
#define pg_dlclose dlclose
#define pg_dlerror dlerror
#endif /* HAVE_DLOPEN */

#endif /* PORT_PROTOS_H */
